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Date: Fri, 21 Jul 2006 23:19:57 -0700
From: glen herrmannsfeldt <gah@ugcs.caltech.edu>
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Date: 2006-07-21T23:19:57-07:00
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Dick Hendrickson wrote:

(snip, I wrote)

>> In addition, note that ECL supplies a signal and its complement without
>> any extra logic needed.

> Maybe, but the CDC 1604s used discrete parts.  Transistors,
> resistors, on a 3 inch by 3 inch circuit board.  I'm pretty
> sure that some design decisions were heavily influenced by
> parts count.

Well, the IBM 360/91 used ASLT, which is pretty much ECL built
from discrete transistors glued on a ceramic substrate.
Most 360's were SLT, which is pretty much discrete TTL.

-- glen